23 Jul 2016 - The French administered Crozet Islands - a sub-Antarctic archipelago in the southern Indian ocean is one of the last remaining untouched places on earth. A CTBTO (Comprehensive Test Ban Treaty Organisation) team is preparing the installation of CTBTOs last hydroacoustic station there. The site's remoteness, harsh and variable weather conditions and rough underwater terrain make this their most complex hydroacoustic project to date.